Recent answers to when my mailbox is empty, it still shows that I have messages. How do I fix thathttps://support.mozilla.org/en-US/questions/9484632013-01-26T12:33:03-08:00Please make sure you are running the latest version of Firefox. See Update Firefox to the latest ver2013-01-26T12:33:03-08:00feer56https://support.mozilla.org/en-US/questions/948463#answer-402082

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
Note: This will temporarily log you out of all sites you're logged in to.
To clear cache and cookies do the following:

Go to Firefox &amp;gt; History &amp;gt; Clear recent history or (if no Firefox button is shown) go to Tools &amp;gt; Clear recent history.

Under "Time range to clear", select "Everything".

Now, click the arrow next to Details to toggle the Details list active.

From the details list, check Cache and Cookies and uncheck everything else.